claw/docs/superpowers/specs/2026-04-19-g6-host-bridge-prerequisites-design.md

G6 Host-Bridge Prerequisites Design

Date: 2026-04-19 Status: Draft Upstream Decision: 2026-04-19-boundary-runtime-prerequisites-decision-report.md

1. Intent

This design defines the next bounded slice after the boundary-runtime prerequisites roadmap selects G6 host-bridge prerequisites.

The target is:

G6 host-bridge prerequisites

2. Why G6 First

G6 is selected because:

1. it is blocked by one clearer prerequisite line
2. that prerequisite line is narrower than the combined local-doc and attachment burden on G8
3. it is the smaller bounded next step after G7

3. Scope Boundary

This design is limited to prerequisite scoping only.

It may include:

1. isolating the minimum host-bridge execution semantics needed before G6 real-sample entry
2. defining a bounded prerequisite slice
3. publishing one follow-up bounded plan

It must not include:

1. executing a G6 real sample
2. implementing host-runtime directly
3. reopening G7
4. opening G8
5. opening G4 / G5

4. Target Outcome

The bounded target outcome is one state:

1. one bounded G6 prerequisites plan

5. Exit Condition

This design is complete when implementation can be bounded to one plan that:

1. freezes the G6 prerequisite boundary
2. isolates the minimum blocked host-bridge capability
3. publishes a bounded follow-up plan